FEATURE (was Re: PROBLEM: multiple mount of devices possible 2.4.0-test1 - 2.4.0-test13-pre4

From: Tigran Aivazian (tigran@aivazian.fsnet.co.uk)
Date: Sat Dec 23 2000 - 13:24:27 EST

  • Next message: Chris Mason: "Re: [RFC] changes to buffer.c (was Test12 ll_rw_block error)"

    it is not a problem, it is a feature. (and a useful one!)

    On Sat, 23 Dec 2000 rkreiner@sbox.tu-graz.ac.at wrote:

    >
    > 1. multiple mount of devices possible 2.4.0-test1 - 2.4.0-test13-pre4
    >
    > 2. its still possible to mount devices several times.
    > IMHO it shouldnt be possible like 2.2.18
    > with umount in /proc/mounts is still the real information,
    > in /etc/mtab all corresponding mountpoints are deleted.
    >
    > 3. kernel, filesystem, mount
    >
    > 4. Linux version 2.4.0-test13-pre4 (root@apollo) (gcc version 2.95.2
    > 19991024 (release)) #1 SMP Sat Dec 23 17:04:07 CET 2000
    >
    > 5. none
    >
    > 6. example
    > #!/bin/sh
    > mount /dev/hda2 /gate
    > mount -t nfs gate:/ /gate
    > mount -t nfs gate:/ /gate
    > mount /dev/hda2 /mnt
    >
    > 7.
    >
    > 7.1
    > -- Versions installed: (if some fields are empty or look
    > -- unusual then possibly you have very old versions)
    > Linux apollo 2.4.0-test13-pre4 #1 SMP Sat Dec 23 17:04:07 CET 2000 i586
    > unknown
    > Kernel modules 2.3.11
    > Gnu C 2.95.2
    > Gnu Make 3.79.1
    > Binutils 2.9.5.0.24
    > Linux C Library x 1 root root 4070406 Jul 30 21:41
    > /lib/libc.so.6
    > Dynamic linker ldd (GNU libc) 2.1.3
    > Procps 2.0.6
    > Mount 2.10m
    > Net-tools 1.56
    > Kbd 0.99
    > Sh-utils 2.0
    > Modules Loaded
    >
    > 7.2
    > processor : 0
    > vendor_id : AuthenticAMD
    > cpu family : 5
    > model : 8
    > model name : AMD-K6(tm) 3D processor
    > stepping : 12
    > cpu MHz : 400.906
    > cache size : 64 KB
    > fdiv_bug : no
    > hlt_bug : no
    > f00f_bug : no
    > coma_bug : no
    > fpu : yes
    > fpu_exception : yes
    > cpuid level : 1
    > wp : yes
    > flags : fpu vme de pse tsc msr mce cx8 pge mmx syscall 3dnow k6_mtrr
    > bogomips : 799.54
    >
    > 7.3
    >
    > 7.4
    > 0000-001f : dma1
    > 0020-003f : pic1
    > 0040-005f : timer
    > 0060-006f : keyboard
    > 0080-008f : dma page reg
    > 00a0-00bf : pic2
    > 00c0-00df : dma2
    > 00f0-00ff : fpu
    > 0170-0177 : ide1
    > 01f0-01f7 : ide0
    > 0213-0213 : isapnp read
    > 02f8-02ff : serial(auto)
    > 0376-0376 : ide1
    > 0378-037a : parport0
    > 03c0-03df : vga+
    > 03f6-03f6 : ide0
    > 03f8-03ff : serial(auto)
    > 0a79-0a79 : isapnp write
    > 0cf8-0cff : PCI conf1
    > 5c20-5c3f : Acer Laboratories Inc. [ALi] M7101 PMU
    > d000-d00f : Acer Laboratories Inc. [ALi] M5229 IDE
    > d400-d43f : Ensoniq ES1371 [AudioPCI-97]
    > d400-d43f : es1371
    > d800-d8ff : Realtek Semiconductor Co., Ltd. RTL-8139
    > d800-d8ff : eth0
    >
    > 00000000-0009fbff : System RAM
    > 0009fc00-0009ffff : reserved
    > 000a0000-000bffff : Video RAM area
    > 000c0000-000c7fff : Video ROM
    > 000f0000-000fffff : System ROM
    > 00100000-07ffbfff : System RAM
    > 00100000-002ef4af : Kernel code
    > 002ef4b0-0031193f : Kernel data
    > 07ffc000-07ffefff : ACPI Tables
    > 07fff000-07ffffff : ACPI Non-volatile Storage
    > de000000-de0000ff : Realtek Semiconductor Co., Ltd. RTL-8139
    > de000000-de0000ff : eth0
    > df000000-dfffffff : PCI Bus #01
    > df000000-df7fffff : Matrox Graphics, Inc. MGA G400 AGP
    > df800000-df803fff : Matrox Graphics, Inc. MGA G400 AGP
    > e0000000-e3ffffff : Acer Laboratories Inc. [ALi] M1541
    > e5f00000-e7ffffff : PCI Bus #01
    > e6000000-e7ffffff : Matrox Graphics, Inc. MGA G400 AGP
    > ffff0000-ffffffff : reserved
    >
    > 7.5
    > 00:00.0 Host bridge: Acer Laboratories Inc. [ALi] M1541 (rev 04)
    > Subsystem: Acer Laboratories Inc. [ALi] ALI M1541 Aladdin V/V+ AGP
    > System Controller
    > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
    > <MAbort+ >SERR- <PERR-
    > Latency: 64
    > Region 0: Memory at e0000000 (32-bit, non-prefetchable) [size=64M]
    > Capabilities: [b0] AGP version 1.0
    > Status: RQ=28 SBA+ 64bit- FW- Rate=x1,x2
    > Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
    >
    > 00:01.0 PCI bridge: Acer Laboratories Inc. [ALi] M5243 (rev 04) (prog-if
    > 00 [Normal decode])
    > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
    > <MAbort- >SERR- <PERR-
    > Latency: 64
    > Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
    > I/O behind bridge: 0000e000-0000dfff
    > Memory behind bridge: df000000-dfffffff
    > Prefetchable memory behind bridge: e5f00000-e7ffffff
    > BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
    >
    > 00:03.0 Bridge: Acer Laboratories Inc. [ALi] M7101 PMU
    > Subsystem: Acer Laboratories Inc. [ALi] ALI M7101 Power Management
    > Controller
    > Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
    > <TAbort- <MAbort- >SERR- <PERR-
    >
    > 00:07.0 ISA bridge: Acer Laboratories Inc. [ALi] M1533 PCI to ISA Bridge
    > [Aladdin IV] (rev c3)
    > Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
    > <TAbort+ <MAbort+ >SERR- <PERR-
    > Latency: 0
    >
    > 00:09.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139
    > (rev 10)
    > Subsystem: Realtek Semiconductor Co., Ltd. RT8139
    > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
    > <TAbort- <MAbort- >SERR- <PERR-
    > Latency: 32 (8000ns min, 16000ns max)
    > Interrupt: pin A routed to IRQ 9
    > Region 0: I/O ports at d800 [size=256]
    > Region 1: Memory at de000000 (32-bit, non-prefetchable) [size=256]
    > Capabilities: [50] Power Management version 2
    > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
    > PME(D0-,D1+,D2+,D3hot+,D3cold+)
    > Status: D0 PME-Enable+ DSel=0 DScale=0 PME-
    >
    > 00:0b.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev
    > 06)
    > Subsystem: Ensoniq Creative Sound Blaster AudioPCI64V, AudioPCI128
    > Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
    > <MAbort- >SERR- <PERR-
    > Latency: 32 (3000ns min, 32000ns max)
    > Interrupt: pin A routed to IRQ 10
    > Region 0: I/O ports at d400 [size=64]
    > Capabilities: [dc] Power Management version 1
    > Flags: PMEClk- DSI+ D1- D2+ AuxCurrent=0mA
    > PME(D0+,D1-,D2+,D3hot+,D3cold-)
    > Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    >
    > 00:0f.0 IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c1)
    > (prog-if 8a [Master SecP PriP])
    > Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
    > <TAbort- <MAbort- >SERR- <PERR-
    > Latency: 32 (500ns min, 1000ns max)
    > Interrupt: pin A routed to IRQ 0
    > Region 4: I/O ports at d000 [size=16]
    >
    > 01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP
    > (rev 03) (prog-if 00 [VGA])
    > Subsystem: Matrox Graphics, Inc. Millennium G400 16Mb SGRAM
    > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    > Stepping- SERR- FastB2B-
    > Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
    > <TAbort- <MAbort- >SERR- <PERR-
    > Latency: 64 (4000ns min, 8000ns max), cache line size 08
    > Interrupt: pin A routed to IRQ 11
    > Region 0: Memory at e6000000 (32-bit, prefetchable) [size=32M]
    > Region 1: Memory at df800000 (32-bit, non-prefetchable) [size=16K]
    > Region 2: Memory at df000000 (32-bit, non-prefetchable) [size=8M]
    > Expansion ROM at e5ff0000 [disabled] [size=64K]
    > Capabilities: [dc] Power Management version 2
    > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
    > PME(D0-,D1-,D2-,D3hot-,D3cold-)
    > Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    > Capabilities: [f0] AGP version 2.0
    > Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
    > Command: RQ=31 SBA+ AGP+ 64bit- FW- Rate=x1
    >
    > 7.6
    >
    > 7.7
    > Mount Version:
    > mount: mount-2.10m
    >
    > Output of /proc/mounts:
    > /dev/root / ext2 rw 0 0
    > proc /proc proc rw 0 0
    > /dev/hda7 /home ext2 rw 0 0
    > /dev/hda9 /data vfat rw 0 0
    > /dev/hda8 /datax vfat rw 0 0
    > /dev/hda10 /data2 vfat rw 0 0
    > /dev/hdb1 /data3 vfat rw 0 0
    > /dev/hda3 /win98 vfat rw 0 0
    > /dev/hda6 /redhat ext2 rw 0 0
    > /dev/hda11 /sicher ext2 ro 0 0
    > /dev/hda13 /sicher2 ext2 ro 0 0
    > /dev/hdb6 /sicher3 ext2 rw 0 0
    > devpts /dev/pts devpts rw 0 0
    > /dev/hda2 /gate vfat rw 0 0
    > gate:/ /gate nfs rw,v2,rsize=8192,wsize=8192,hard,udp,lock,addr=gate 0 0
    > gate:/ /gate nfs rw,v2,rsize=8192,wsize=8192,hard,udp,lock,addr=gate 0 0
    > /dev/hda2 /mnt vfat rw 0 0
    >
    > X.
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